matlab - How to statistically plot and show the difference between two fluctuations -

this kind of tricky question.so if cannot understand kindly post comments.

this data between anchor , source dbm values.

if see first set of data between a=30,s=50 , can see fluctuation in dbm values in different channels. taking average of these 4 channel combinations give -72.75

 **a = 30  s = 50** ,   a-s distance =  18.00   rssi value  a-chan 0 , s-chan 0  -69  rssi value  a-chan 0 , s-chan 1  -73  rssi value  a-chan 1 , s-chan 0  -73  rssi value  a-chan 1 , s-chan 1  -76 

now next case follows

in case reverse of above (i.e.) a=50,s=30. can see fluctuations between channels , average dbm value -74.75

 **a = 50  s = 30** ,   a-s distance =  18.00   rssi value  a-chan 0 , s-chan 0  -74  rssi value  a-chan 0 , s-chan 1  -77  rssi value  a-chan 1 , s-chan 0  -73  rssi value  a-chan 1 , s-chan 1  -75 

now,if see in "a=30,s=50"the dbm value "-72.75" , in "a=50,s=30" dbm value of "-74.75". there fluctuation or difference between these 2 values.

my question want plot these 2 statistical plot or in graph plot showing difference between them.

how can done ?

do have suggestions on how can done statistically ?

thank in advance.